[Enhanced Senses] Darkness, Night Vision, and flickering

[Anthony]

Originally Posted by Anaraxes

So it does. That's a reasonable time for cone response. I had in mind the pupillary response, with perhaps the first point or so of the cone adaptation, two or maybe three levels of penalty. I don't have to wait for four minutes to be able to see after crossing from street lights to a normally lit residential room, or when stepping from a dim-to-normal room into a hall with no lights before becoming able to make out the stairs well enough that it's not dangerous to go down them.

Pupillary response is limited to the equivalent of about 1 level, and mostly doesn't apply in situations where GURPS would assign darkness penalties in the first place because your pupils are fully distended even at the brighter level of illumination. The examples I can see of for rapid adaptation are mostly either "to bright to have darkness modifiers in the first place", such as sunlight to indoors, or "simple enough that it doesn't actually matter that your vision isn't entirely adapted".